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Human_vulva_with_visible_urethral_opening.jpg (350 × 379 pixels, file size: 83 KB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The urinary meatus [a] (/ m iː ˈ eɪ t ə s /, mee-AY-təs; pl.: meati or meatuses), also known as the external urethral orifice, is the opening of the penis or vulva where urine exits the urethra during urination. It is also where semen exits during male ejaculation, and other fluids during female ejaculation. The meatus has varying degrees ...
Structures opening in the vulval vestibule are the urethra (urinary meatus), vagina, Bartholin's glands, and Skene's glands. [1]The external urethral orifice is placed about 25–30 millimetres (1–1.2 in) [2] behind the clitoris and immediately in front of that of the vagina; it usually assumes the form of a short, sagittal cleft with slightly raised margins.
The human male urethra laid open on its anterior (upper) surface. In the human male, the urethra is on average 18 to 20 centimeters (7 to 8 inches) long and opens at the end of the external urethral meatus. [10] The urethra is divided into four parts in men, named after the location: [10]
During sexual arousal, they are lubricated by the mucus secreted in the vagina and around it to make penetration painless and protect them from irritation. As the female external urethral opening (meatus) is also situated between labia minora, they may play a role in guiding the stream of the urine during female urination.
In most other placentals, the urethra and vagina join as an internal vestibule (urogenital sinus), hence both urine and offspring exit through an orifice called the vulvar opening. [185] [186] [187] During estrus, the clitoris of a mare (female horse) everts as the labia contracts by opening and closing. This is colloquially known as "winking ...
The glands may be the source of female ejaculation, [3] [4] [5] but this has not been proven. [4] Because they and the male prostate act similarly by secreting prostate-specific antigen (PSA), which is an ejaculate protein produced in males, and prostatic acid phosphatase, some authors refer to the Skene's glands as the "female prostate".